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Design-and-Analysis-of-Algorithms-Subject-Code--10CSL47-Lab-Manual-PROGRAM-11-->View question


Asked On2017-06-05 06:19:34 by:Aparna-Dasgupta

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LOOK is a disk scheduling algorithm used to determine the order in which new disk read and write requests are processed.
The LOOK algorithm is the same as the SCAN algorithm in that it also honors requests on both sweep direction of the disk head, however, this algorithm "Looks" ahead to see if there are any requests pending in the direction of head movement. If no requests are pending in the direction of head movement, then the disk head traversal will be reversed to the opposite direction and requests on the other direction can be served. In LOOK scheduling, the arm goes only as far as final requests in each direction and then reverses direction without going all the way to the end. Consider an example, Given a disk with 200 cylinders (0-199), suppose we have 8 pending requests: 98, 183, 37, 122, 14, 124, 65, 67 and that the read/write head is currently at cylinder 53. In order to complete these requests, the arm will move in the increasing order first and then will move in decreasing order after reaching the end. So, the order in which it will execute is 65, 67, 98, 122, 124, 183, 37, 14.


Answerd on:2017-06-14 Answerd By:tarun101

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